儀器概述
正丁醇冷凝粒子計數器（英文名：Airmodus A20 Butanol Condensation Particle Counter；英文縮寫：A20bCPC）由位于芬蘭的Airmodus公司研發制造。A20bCPC是一款基于現代超細氣溶膠測量技術研發的冷凝粒子計數器。在很低濃度和高濃度粒子環境中均能夠精確計數，是大氣環境監測和氣溶膠研究的理想工具。
A20bCPC可以應用于所有領域的氣溶膠粒子測量研究；尤其當精確度和靈敏度成為核心時，A20bCPC必然成為有力、可靠的工具。它可以方便地測量7nm以上的氣溶膠粒子。
A20bCPC是用途廣泛的計數器，既可獨立運行，測量顆粒物總數濃度；也可以接入不同類型的氣溶膠測量系統，用于計數。該儀器易于操作、使用。前面板的觸屏可以顯示當前濃度讀數和儀器診斷參數，所有設置也可通過觸屏迅速調整。
A20bCPC也可以兼容Airmodus粒子放大器A10。當所研究粒徑降低到1nm時，請選用A10PSM！
技術優勢
低濃度下高效率計數：儀器經過特殊設計，沒有稀釋進樣氣流
高濃度下的高精度測量：單個計數模式下，量程高達30000個/cm3；更高濃度時，總散射模式訂正會自動啟用
觸屏顯示及操控同時，通過控制軟件更方便地調試并采集數據；儀器軟件隨儀器郵寄
所有連接均可輕松訪問
應用范圍
氣溶膠粒子測量研究的所有領域，包括：大氣環境監測和氣溶膠研究，室內空氣質量評估，過濾器和空氣濾清器測試，大氣和氣候研究，粒子計數器校準，燃燒和發動機尾氣的研究，呼吸檢測和暴露評價，健康影響研究，納米技術研究。
技術指標
粒徑測量范圍：7-1000 nm，50%切割效率對應7nm
濃度測量范圍：0-100000#/cm3
在單顆粒模式下，最高測量數濃度可達30000#/cm3，且重合率低于10%；更高濃度時，自動啟用總散射模式訂正
采樣流量范圍：1 LPM，通過臨界小孔片/限流孔控制
使用液體：正丁醇
運行溫度范圍：15 - 35 °C
通信接口：
模擬信號輸入：BNC連接器，0-10V（用于讀取外部設備信號）；
模擬信號輸出：BNC連接器，0-10V，可選輸出方式（線性濃度，DMA電壓控制）；
脈沖信號輸出：BNC連接器；
串口輸出：RS-232，以太網：8線RJ45；
USB：B型連接器連接方式：外部真空度：1/4英寸的不銹鋼管；入口：1/4英寸的不銹鋼管；
外部真空要求：常溫常壓下，小于0.4 bar
尺寸：260 * 230 * 400（H*W*D mm）
重量：10.5kg
電源：88 - 264 VAC，320 W
工作原理
由于納米級顆粒物不能通過光學進行測量，該類粒子必須通過冷凝在其表面的高飽和度工作流體使其生長至光學可測量范圍，該儀器可測粒徑范圍為7-1000nm。A20bCPC選擇正丁醇作為冷凝劑。
Airmodus Condensation Particle Counters are designed to count individual aerosol particles accurately from very low to high concentrations. They are ideal for ambient air monitoring as well as aerosol research.
The A20 is a robust and reliable tool for aerosol particle measurements in all applications where precision and sensitivity is of the essence. It is a user-friendly tool for counting aerosol particles larger than 5 nm (by request A20 can be delivered with a cut-off between 5 – 10 nm, e.g. for ambient measurements 7 nm).
A versatile particle counter
The A20 can be used both as a stand-alone instrument for measuring the total particle number concentration, and as a counter in different kinds of aerosol measurement systems. It is easy to use and handle. All settings can be quickly adjusted from a handy touch screen, which also displays the current concentration reading and instrument diagnostics.
The A20 is also compatible with the Airmodus Particle Size Magnifier A10. Use the A10 when you want to study particles as small as 1 nm!
Benefits of the A20
- High statistics for low concentrations: the instrument is specially designed for precise particle counting and the sample flow is not diluted
- High accuracy for high concentrations:
up to 30 000#/cm3 in single particle counting mode, for higher
concentrations the Total Scattering Mode Correction is automatically applied
- In addition to the easy to use touch screen, adjusting the settings and data logging is easy. User-friendly
operation software is delivered with the instrument
- All connections optimized for easy access
Particle size range 5 nm – 2.5 μm
Dp50% = 5 nm* (on request 5 – 10 nm)
Concentration 0 – 100 000 #/cm3
Up to 30 000 #/cm3 in single particle counting mode with coincidence <10%; higher concentrations with Total Scattering Mode Correction
Aerosol sample flow Nominal flow 1 lpm, controlled with a critical orifice
Response time t90 < 3 s
False counts <0.001 #/cm3
Working fluid n-Butanol (>99.5%)
Operating temperatures
Saturator: 39oC Condenser: 15oC Optics: 40oC
Sample conditions
Pressure: 75 to 105 kPa
Relative humidity: 0 to 95% non-condensing (preferably <40%)**
Environmental conditions
Temperature: 15oC to 35oC Pressure: 75 to 105 kPa
Relative humidity: 0 to 95% non-condensing
Communication Analog in: BNC connector, 0 to 10 V (reading data of external sensor) Analog out: BNC connector, 0 to 10 V, user-selectable function output (linear concentration, also DMA voltage control)
Pulse out: BNC connector
Serial: RS-232
Ethernet: RJ45
USB: type B connector
All communication based on ASCII character-encoding scheme.
Fittings External Vacuum: 1/4 in. stainless steel tube
Inlet: 1/4 in. stainless steel tube
Software Airmodus A2X software for online data acquisition (for Microsoft Windows)
External vacuum requirement
100 - 400 mbar pressure at NTP (or <40% of inlet pressure)
Power requirements 100 - 240 VAC
max. 320 W
universal AC input/full range
Dimensions and weight
260x230x400 (height x width x depth in mm)
10.5 kg
Shipping conditions Temperature: 0 - 40oC
Relative humidity: <95% non-condensing
The instrument should be shipped in upright position and should be protected against tremor and blows.
*) Cut-off size in mobility equivalent diameter. See calibration certificate. On request the cut-off can be calibrated to be in the range 5 – 10 nm.
**) With high relative humidity, an aerosol drier should be used to prevent excess water condensation inside the instrument. Microsoft and Windows are registered trademarks of Microsoft Corporation.
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